Floodplain mapping is key to keeping areas updated with adjustments to flood risk potential and floodplain boundaries from both natural and anthropogenic changes. To do so, the Mile High Flood District uses Flood Hazard Area Delineation (FHAD) and Master Drainage Plan (MDP) studies.

For more information check out the different floodplain maps via the Data Viewer and download the following FHAD information.

The FHAD guidelines were last updated in January 2022. For an overview of the updates made, please watch this video.

Keeping the regulatory flood hazard data up-to-date both on a local and national level is important for many reasons, including saving people money on their flood insurance. That’s why the Mile High Flood District works closely with FEMA to incorporate Flood Hazard Area Delineation (FHAD) data into the Flood Insurance Rate Maps (FIRMs) and Flood Insurance Studies (FISs) through a process called Physical Map Revision (PMR).

In order to change preliminary FIRM information, a Letter of Map Change (LOMC) must be submitted. These can be sent at any time but must follow specific guidelines. Use the following documents to prepare and submit your LOMC properly

Not to be confused with Letters of Map Change (LOMC), a Letter of Map Revision (LOMR) is FEMA’s official modification to a FIRM. But like the LOMC, there are specific guidelines surrounding when to use an LOMR vs. an Appeal.

FEMA GeoPortal

NFIP 101 Course and Reference Guide